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Naddik [55]
3 years ago
12

Solve the equation below r+3=3(r-5)

Mathematics
2 answers:
zubka84 [21]3 years ago
5 0

Answer:

r = 9

Step-by-step explanation:

r + 3 =3 (r - 5)

1. remove brackets and simplify

r + 3 = 3r − 15

2. Subtract 3r from both sides

r + 3 <u><em>−3r</em></u> = 3r −15 <u><em>−3r</em></u>

−2r + 3 = −15

3. Subtract 3 from both sides.

−2r + 3 <em><u>−3</u></em> = −15 <em><u>−3</u></em>

−2r = −18

4. Divide both sides by -2.

−2r = −18

___   ___

-2    =  -2

r = 9

<em><u>Please mark as brainliest if answer is right </u></em>

Have a great day, be safe and healthy  

Thank u  

XD

marin [14]3 years ago
3 0

Answer:

r = 9

Step-by-step explanation:

Given

r + 3 = 3(r - 5) ← distribute

r + 3 = 3r - 15 ( subtract r from both sides )

3 = 2r - 15 ( add 15 to both sides )

18 = 2r ( divide both sides by 2 )

9 = r

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Which of the ordered pairs is a solution of the following equation <br> 5x-2y=20
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Step-by-step explanation:

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Here we will show you how to calculate the following:

Calculate and show the solution for the x-intercept and y-intercept of 5x + 2y = 20.

Calculate the graph plot coordinates for 5x + 2y = 20

Solve 5x + 2y = 20 for x and also for y.

Calculate and show the solution for the slope of 5x + 2y = 20

Find x-intercept

The x-intercept is where the graph crosses the x-axis. To find the x-intercept, we set y1=0 and then solve for x.

5x + 2y = 20

5x + 2(0) = 20

x1 = 4    y1 = 0

Find y-intercept

The y-intercept is where the graph crosses the y-axis. To find the y-intercept, we set x2=0 and then solve for y.

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Get Graph Plot Coordinates

Getting two graph points will allow you to make a straight line on a graph. The plot coordinate format is (x1,y1) and (x2,y2).

Thus, we use the x-intercept and y-intercept results above to get the graph plots for 5x + 2y = 20 as follows:

(x1,y1) and (x2,y2)

(4,0) and (0,10)

Find slope

The slope of the line (m) is the steepness of the line. It is the change in the y coordinate divided by the corresponding change in the x coordinate. Simply plug in the coordinates from above and solve for m to get the slope for 5x + 2y = 20

m = (y2 - y1)/(x2 - x1)

m = (10 - 0)/(0 - 4)

m = -2.5

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